13450-RAA-A02 Tensioner - Overview. The 13450-RAA-A02 Tensioner is a vital component specifically designed for Honda marine engine systems, particularly supporting the balancer shaft chain system. This tensioner maintains the correct tension on the timing or oil pump chain, which is essential for proper engine operation and performance. By keeping the chain taut, it prevents slack that could potentially lead to engine damage or inefficient operation, thus ensuring reliable and smooth running of